dqn-smoke: Walk-forward validation DQN uses raw price returns (~0.001),
not production reward_scale=10. Set v_min/v_max to ±10 for the small
16-dim 3-action test network (was inheriting ±240 from production default).
dqn-early-stop: Gradient collapse threshold = lr × multiplier must exceed
the actual gradient norm to trigger collapse. With v_range ±240, gradient
norms reach 100-10000 (was ~0.5-2.0 with old ±2.0 range). Updated
multiplier from 1e9 to 1e12 to guarantee threshold (10000) > grad norm.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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